Adapter circuitry for computers to support computer telephony

Details Adapter circuitry for computers to support computer telephony Adapter circuitry for computers to support computer telephony

1998-09-01

2000-03-21

Loomis, Paul

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 9331, 379 9336, H04M 1100

Patent

active

060411058

ABSTRACT:
An external adapter circuitry is plugged into the printer port of a host computer to provide the utility of computer telephony for the host computer. The circuitry is housed in a compact box which is about the size of a common parallel port connector. The circuitry consists of a telephone line interface for receiving and sending signals from/to the telephone line; a printer port interface for sending data to and receiving data from the host computer; a couple of registers for latching signal-in and signal-out; a A/D converter for converting analog signals to digital signals; and a D/A converter for converting digitized signals to analog signals. More specially, the electricity of the entire circuitry is supplied from a signal-to-power converter which obtains voltages from the printer port. Therefore, the external adapter circuitry does not need a power line for external power supply.

REFERENCES:
patent: 5343516 (1994-08-01), Callele et al.
patent: 5408614 (1995-04-01), Thornton et al.

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